Re: aicasm: fix kbuild for separated build directories

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Thu, 2016-02-18 at 00:46 +0100, Michal Marek wrote:
> On Fri, Feb 12, 2016 at 02:42:26PM -0800, James Bottomley wrote:
> > I've recently been experimenting with building in emulated 
> > architecture containers which allow me to build natively on my 
> > laptop a kernel for any architecture which qemu will emulate.  To 
> > do this, I've been building into build/$(uname -m) and this caused 
> > the aicasm stuff to fail to build (using CONFIG_AIC7XXX_BUILD_FIRMW
> > ARE=y).  I think this patch corrects the problem, but I'm not 
> > hugely familiar with the kbuild infrastructure so I cc'd an expert
> > for a second opinion.
> 
> Hi James,
> 
> Sorry for the late reply. Letting kbuild handle the aicasm directory 
> is a step in the right direction. However, it still failed for me and
> instead of trying to understand how the rules work, I removed them 
> and used the existing kbuild infrastructure. Please try the patch 
> below on top of yours.

Sorry for the late testing.  This patch causes the build to fail again
for me:

make[5]: *** No rule to make target
'drivers/scsi/aic7xxx/aicasm/aicasm_scan.lex.c', needed by
'drivers/scsi/aic7xxx/aicasm/aicasm_scan.lex.o'.  Stop.
/home/jejb/git/scsi-misc/drivers/scsi/aic7xxx/Makefile:85: recipe for
target 'drivers/scsi/aic7xxx/aicasm/aicasm' failed
make[4]: *** [drivers/scsi/aic7xxx/aicasm/aicasm] Error 2
/home/jejb/git/scsi-misc/scripts/Makefile.build:407: recipe for target
'drivers/scsi/aic7xxx' failed
make[3]: *** [drivers/scsi/aic7xxx] Error 2
make[3]: *** Waiting for unfinished jobs....
/home/jejb/git/scsi-misc/scripts/Makefile.build:407: recipe for target
'drivers/scsi' failed

I think the problem is simply that we now have two separate options for
building the firmware: REGENERATE_PARSERS and
 CONFIG_AIC7XXX_BUILD_FIRMWARE and the latter needs to be eliminated. 
 I'll see if I can work out what's missing.

James